Skip to main content

Free Content Proximal Growth of the Column in Bathycrinid Crinoids (Echinodermata) Following Decapitation

Download Article:
(PDF 278.9 kb)


Individuals of the bathycrinid crinoids Democrinus chuni (Döderlein) and Democrinus brevis (A. H. Clark) remain upright following loss of the crown and proximal column. The axial canal is sealed in the apical part of the column by stereomic calcite overgrowth, and radice-like extensions are generated; one specimen has a more globular, gall-like growth, suggesting parasitic infestation. Oxygen and nutrients were presumably absorbed through the ectoderm in these “headless” crinoids. Evidence of breakage and the absence of autotomy planes in the mesistele of Democrinus imply that crown loss was probably due to predation. These specimens represent about 1.6% of the examined sample. The life expectancy of mutilated specimens was presumably short. Analogous patterns of regeneration are known from as far back as the Ordovician.

Document Type: Research Article

Publication date: November 1, 1997

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • ingentaconnect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more